Wow - I haven't heard that before, but it does sound logical!
I would definitely move her up into stables, and yes as Jaykay says, see if you can carefully manoeuvre her into a trailer of some kind, and depending on access either quadbike or tractor/4 x4 and trailer. We often move our sheep in just the trailer with the high-sided mesh on, so no roof, and that works well. I guess she is not able to jump much at the moment... many farmers will also have one of the small trailers that they use to move one or two ewes and lambs to the field?
Good luck with her and hopefully it will sort itself out after kidding.